Abstract Catalytically active membranes are the core components of the membrane reactors. Polysulfone (PSF) grafted with ionic liquids (ILs), PSF-DG-ILs, was prepared via introducing chloromethyl group into benzene ring of PSF, then grafting ILs, imidazolyl acid ILs ([(CH2)3SO3HVIm]HSO4), by chemical bonding. Then PSF-DG-ILs membranes were prepared by non-solvent induced phase separation technique for hydrolysis of inulin. The effects of coagulation bath, grafting degree, and various dope blending on structure, physico-chemical characters, and catalytic performance of membranes were evaluated. And results revealed that catalytic performance could be efficiently enhanced by choosing ethanol as coagulation compared with ethyl acetate, which was mainly attributed to surface segregation. Membrane mechanical strength decreased with the enhancing ILs grafting degree, while the catalytic performance increased. However, PSF-DG-ILs with high degree of ILs grafting lost its membrane-forming property. The mechanical and catalytic properties of the membrane were synergistically enhanced by blending PSF-DG-ILs polymers with high and low ILs grafting degree, then the resulting membranes broke the trade-off effect between mechanical strength and catalytic ability. Specifically, membrane fabricated by mixing the polymers with ILs grafting degree of 0.31 and 0.59 integrates optimized mechanical property and catalysis performance. The strength and strain of this blending membrane are 3.17 MPa and 14.10%. The average pore size and porosity are 215.5 nm and 46.2%. The yield of inulin hydrolysis can reach 88.22% with 20 wt% concentration of inulin at 75 °C using a flux of 23.4 L/(m2·h). Therefore, the PSF-DG-ILs membrane displayed promising potential for the application in biomass conversion.

中文翻译：

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酸性离子液体接枝聚砜制备多孔聚合物膜及其对菊粉水解的催化性能

摘要 催化活性膜是膜反应器的核心部件。接枝离子液体（ILs）的聚砜（PSF），PSF-DG-ILs，是通过在PSF的苯环上引入氯甲基，然后通过化学键接接ILs，咪唑酸ILs（[（CH2）3SO3HVIm]HSO4）制备的. 然后通过非溶剂诱导相分离技术制备了用于菊粉水解的PSF-DG-ILs膜。评价了凝固浴、接枝度和各种涂料掺混对膜结构、理化特性和催化性能的影响。结果表明，与乙酸乙酯相比，选择乙醇作为混凝剂可以有效提高催化性能，这主要归因于表面偏析。膜机械强度随着ILs接枝度的提高而降低，而催化性能提高。然而，具有高度ILs接枝的PSF-DG-ILs失去了其成膜特性。通过共混具有高和低ILs接枝度的PSF-DG-ILs聚合物，膜的机械和催化性能协同增强，从而打破了机械强度和催化能力之间的权衡效应。具体而言，通过混合聚合物与 0.31 和 0.59 的 ILs 接枝度制备的膜整合了优化的机械性能和催化性能。该共混膜的强度和应变为3.17 MPa和14.10%。平均孔径和孔隙率为 215.5 nm 和 46.2%。菊粉水解收率可达88。在 75 °C 下使用 23.4 L/(m2·h) 的通量，22% 的菊粉浓度为 20 wt%。因此，PSF-DG-ILs 膜显示出在生物质转化中的应用潜力。